US4730922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Absorbance, turbidimetric, fluorescence and nephelometric photometer
Assignee: Dade Behring Inc
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Filing: 1985-05-08
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Granted: 1988-03-15
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Expires: 2005-05-08
Abstract
Abstract An absorbance, turbidimetric, fluorescence, and nephelometric photometer is constructed by providing a sample cell having a rectangular absorbance/turbidimetric cross-section for radiation. The cells exit aperture is positioned to be the entrance aperture for a grating which separates the light according to wavelength and impingement on an array detector.
Inventors
- 👤 David T. Bach
- 👤 Charles W. Robertson, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:17
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/01; G01N21/03; G01N21/05; G01J; G01J3/00; G01J3/12; G01J3/18; G01J3/1838; G01J3/28; G01J3/2803; G01N2021/1738; G01N21/62; G01N21/63; G01N21/64; G01N21/645; G01N2021/6482; G01N21/47; G01N21/49; G01N21/51; G01N21/59; G01N2201/00; G01N2201/06; G01N2201/069; G01N2201/0696
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
93 words
In a multi-function photometer having a sample cell for containing a liquid to be measured, a grating, an array of photodiodes, and a source of radiation directed along a first axis through the cell to the grating for dispersing the radiation according to wavelength onto respective different ones of the photodiodes, thereby to provide output signals corresponding to the intensity of radiation at each wavelength, the improvement wherein the sample cell defines an exit aperture perpendicular to the first axis, the exit aperture being positioned to be the entrance aperture for the grating.
Claim 2
Dependent Claim
93 words
In a multi-function photometer having a sample cell for containing a liquid to be measured, a grating, an array of photodiodes, and a source of radiation directed along a first axis through the cell to the grating for dispersing the radiation according to wavelength onto respective different ones of the photodiodes, thereby to provide output signals corresponding to the intensity of radiation at each wavelength, the improvement wherein the sample cell defines an exit aperture perpendicular to the first axis, the exit aperture being positioned to be the entrance aperture for the grating.
Claim 3
Dependent Claim
31 words
The photometer set forth in claim 1 wherein the sample cell has a rectangular cross-section perpendicular to the first axis that is larger in all dimensions than the exit aperture cross-section.
Claim 4
Dependent Claim
57 words
The photometer set forth in claim 2 which includes a second source of radiation directed along a second axis perpendicular to the first axis for exciting fluorescence of liquid in the sample cell, the sample cell having a fluorescent entrance aperture lying on the second axis, the fluorescent radiation exiting the cell through the grating entrance aperture.
Claim 5
Dependent Claim
29 words
The photometer set forth in claim 3 wherein the cross-sectional area of the fluorescence entrance aperture is greater than the cross-sectional area of the cell along the first axis.
Claim 6
Dependent Claim
54 words
The photometer set forth in claim 4 which includes a straylight filter disposed between the grating and the photodiode array, the filter having two filer sections, one selected to pass exciting radiation from the second source, the other selected to pass the fluorescent radiation to match that of fluorophores used in the liuqid sample.
Claim 7
Dependent Claim
31 words
The photometer set forth in claim 5 which also includes means for scanning the several output signals to obtain a wavelength related distribution of radiation intensities emitted from the sample cell.
Claim 8
Dependent Claim
57 words
The photometer set forth in claim 1 which includes a second source of radiation directed along a second axis perpendicular to the first axis for exciting fluorescence of liuqid in the sample cell, the sample cell having a fluorescent entrance aperture lying on the second axis, the fluorescent radiation exiting the cell through the grating entrance aperture.
Claim 9
Dependent Claim
29 words
The photometer set forth in claim 7 wherein the cross-sectional area of the fluorescence entrance aperture is greater than the cross-sectional area of the cell along the first axis.
Claim 10
Dependent Claim
102 words
The photometer set forth in claim 1 which includes a second source of radiation directed along a second axis perpendicular to the first axis for exciting fluorescence of liquid in the sample cell, the sample cell having a fluorescent entrance aperture lying on the second axis, the fluorescent radiation exiting the cell through the grating entrance aperture and a straylight filter disposed between the grating and photodiode array, the filter having two filter sections, one selected to pass exciting radiation from the second source, the other selected to pass the fluorescent radiation to match that of fluorophores used in the liquid sample.
Claim 11
Dependent Claim
54 words
The photometer set forth in claim 3 which includes a straylight filter disposed between the grating and the photodiode array, the filter having two filter sections, one selected to pass exciting radiation from the second source, the other selected to pass the fluorescent radiation to match that of fluorphores used in the liquid sample.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-15 | 1991-09-14 | 1992-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-15 | 1995-09-14 | 1996-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-15 | 1999-09-14 | 2000-03-15 | $7700.00 | Window Closed / Lapsed |